Ages for Opal at Cascade Range, Siskiyou Co., California, USA

The cyan highlights indicate which age entries were selected as the "best" for assigning the mineral an age of Ma - Ma at this locality

• Locality age

• Excel ID	Max Age (Ma)	Min Age (Ma)	Dated Mineral	Minerals explicitely stated as having this age	Age applies to these Elements	Dated Locality ID	Dated Locality	Ref	Ref ID
  NAVDAT-10023	0.54	0.42				94310	Glass Mountain Industries (Glass Mountain Volcolite Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-10025	0.06	0.04				93904	Block Pumice Claims (Glass Mountain Mine), Indian Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-22445	1.11155	0.90945				232572	Indian Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-22459	1.11155	0.90945				94045	Unnamed Cinder Pit [2], Porcupine Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29586	1.8	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29587	1.8	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29588	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29589	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29590	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29591	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29592	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29593	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29594	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29595	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29596	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-29597	0.01	0				94270	Fouch Occurrence (Thompson Pumice Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-31574	1.8	0				94087	Copco Dam Borrow Pit, Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-31575	1.8	0				94087	Copco Dam Borrow Pit, Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-31576	1.8	0				94087	Copco Dam Borrow Pit, Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-31577	1.8	0				94087	Copco Dam Borrow Pit, Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-31578	1.8	0				94087	Copco Dam Borrow Pit, Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-43258	4.56	3.66				94087	Copco Dam Borrow Pit, Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-43259	9.18	8				232353	Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52833	0.549	0.029				93904	Block Pumice Claims (Glass Mountain Mine), Indian Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52861	0.549	0.029				232109	Little Mount Hoffman, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52885	0.549	0.029				232109	Little Mount Hoffman, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52893	0.549	0.029				215048	Unnamed Obsidian Occurrence [1], Cougar Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52950	0.549	0.029				95345	Unidentified Stone Location [11], Hippo Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52957	0.549	0.029				95314	Tionesta Quarry, High Hole Crater, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52958	0.549	0.029				95314	Tionesta Quarry, High Hole Crater, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-52992	0.549	0.029				94549	Johnson Mine (G. Z. Johnson), Paint Pot Crater, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53008	0.549	0.029				94046	Unnamed Cinder Pit [3], Porcupine Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53031	0.549	0.029				233665	High Hole Crater, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53032	0.549	0.029				233665	High Hole Crater, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53049	0.549	0.029				93904	Block Pumice Claims (Glass Mountain Mine), Indian Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53059	0.549	0.029				232109	Little Mount Hoffman, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53107	0.549	0.029				93997	Cougar Butte Occurrence (Canyon Butte; Couger Butte), Cougar Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53151	0.549	0.029				94045	Unnamed Cinder Pit [2], Porcupine Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53159	0.549	0.029				93904	Block Pumice Claims (Glass Mountain Mine), Indian Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53179	0.549	0.029				233664	Yellowjacket Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53191	0.549	0.029				94310	Glass Mountain Industries (Glass Mountain Volcolite Company), Glass Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53234	0.549	0.029				94592	Klamath Concrete Pipe Company, Black Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53260	0.549	0.029				95345	Unidentified Stone Location [11], Hippo Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-53390	3.04	0.583				94721	McCloud River Railroad Deposit, Indian Spring Mountain, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-8307	33	20				95453	Unnamed Au Placer [107], Ager, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-8310	33	20				95440	Unnamed Stone Deposit [22], Copco, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-8315	33	20				95453	Unnamed Au Placer [107], Ager, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93462	0.12	0.08				233317	Cinder Cone, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93471	0.12	0.08				95596	Yellow Butte Quarry, Yellow Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93482	0.006	0.002				122810	Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93486	0.006	0.002				122810	Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93487	0.006	0.002				122810	Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93523	0.01	0.0094				233224	Black Butte, Black Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93527	0.08	0.01				122810	Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93529	0.08	0.01				94293	Unnamed Gemstone Occurrence [2], Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93530	0.08	0.01				94293	Unnamed Gemstone Occurrence [2], Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93541	0.25	0.13				234181	Gray Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93542	0.25	0.13				234181	Gray Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93546	0.25	0.13				94790	Mount Shasta Gravel Company, Mount Shasta, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93556	0.25	0.13				232175	McKenzie Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93557	0.25	0.13				232175	McKenzie Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT
  NAVDAT-93558	0.25	0.13				232175	McKenzie Butte, Cascade Range, Siskiyou Co., California, USA	NAVDAT	NAVDAT